Thank you for taking the time to provide this very useful Captcha solution!

I have to admit I am having a little problem with following what needs to be done and would appreciate a little help.

I have downloaded your Formmail Script in Part one, made the changes you highlight to personalise it to my domain, private key. and when I test the form it allows the form to be sent without checking the Captcha input data! I notice in Part 2 that you talk of adding more information, but to me it is not clear where this info. is expected to be placed? ...in my HTML/PHP file ? and if so where in the Head/Body? or is this further changes to the Formamil script itself?

Basically would these extra changes in Part 2 solve my problem of verification of Captcha input?